<?php
// This file is part of BOINC.
// http://boinc.berkeley.edu
// Copyright (C) 2008 University of California
//
// BOINC is free software; you can redistribute it and/or modify it
// under the terms of the GNU Lesser General Public License
// as published by the Free Software Foundation,
// either version 3 of the License, or (at your option) any later version.
//
// BOINC is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
// See the GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with BOINC. If not, see <http://www.gnu.org/licenses/>. 
//
// This file was modified by contributors of "BOINC Web Tweak" project.

// express a time difference in readable form
//
function time_diff_str($t1, $t2) {
	if (!$t1 || !$t2) return "---";
	$diff = $t2 - $t1;
	if ($diff<0){
	$pre="In "; 
	$post=""; 
	$diff=-$diff;
	} else {
	$pre="";
	$post=" ago";
	}
	$x = "";


	if ($diff >= 3600*24) {
		$n = (int) ($diff/(3600*24));
		if ($n == 1) {
			$x .= "1 day ";
		} else {
			$x .= "$n days ";
		}
		return $pre.$x.$post;
		//$diff -= $n*3600*24;
	} elseif ($diff >= 3600) {
		$n = (int) ($diff/3600);
		if ($n == 1) {
			$x .= "1 hour ";
		} else {
			$x .= $n." hours ";
		}
		return $pre.$x.$post;
		//$diff -= $n*3600;
	} elseif ($diff >= 60) {
		$n = (int) ($diff/60);
		if ($n == 1) {
			$x .= "1 minute ";
		} else {
			$x .= $n." minutes ";
		}
		return $pre.$x.$post;
	} elseif($diff > 1 || $diff==0) {
		return $pre."$diff seconds".$post;
	} elseif($diff == 1){
		return $pre."$diff seconds".$post;
	}	
}
?>
